This book constitutes the proceedings of the 9th International Symposium on NASA Formal Methods
NFM 2017 held in Moffett Field CA USA in May 2017. The 23 full and 8 short papers presented
in this volume were carefully reviewed and selected from 77 submissions. The papers focus on
formal techniques and other approaches for software assurance their theory current
capabilities and limitations as well as their potential application to aerospace robotics
and other NASA-relevant safety-critical systems during all stages of the software life-cycle.
